Floor sinks



May 10, 1966 H. BERGENBLAD FLOOR S INKS Filed April 1, 1965 United States Patent Office 3,250,289 Patented May 10, 1966 3,250,289 FLOOR SINKS Harry Bergenblad, 14C Strandvagen, Huskvarna, Sweden Filed Apr. 19, 1963, Ser. No. 274,240 1 Claim. (Cl. 137247.13)

This invention relates to improvements in sinks adapted to be located in openings in the floor of bathrooms or the like and comprising an annular flange to be attached to the floor, a water trap located below said flange, a valve means, and a drain pipe.

Such devices of the prior art often suffer from the drawback that dirt, mud and all kinds of impurities get the opportunity to become dry or set and thereby jeopardize the proper operation of the sink and its valve means in particular.

One object of the invention is to eliminate this drawback and to provide a sink having a simple and yet effective shut off or valve means which is reliable in operation.

A further object of the invention is to improve the hygiene of such sinks.

With these and other objects in view the sink according to the invention is provided with an internal flange which is located below the liquid level of the water trap of the sink and constitutes a support for a shut off valve settable from above. In a preferred embodiment this shut off valve is located in its entirety below the liquid level of the water trap.

Further objects and advantages of the invention will become more fully apparent from the following description and the accompanying drawings illustrating one preferred embodiment of the invention, and in which FIG- URE 1 is a diagrammatic vertical cross sectional view through a device according to the invention; FIGURE 2 is a fragmentary plan view showing the means of fastening the annular disc to the internal flange means;

and FIGURE 3 is an enlarged detailed view taken substantially along the line 3-3 of FIGURE 2.

The sink or drain which is adapted to be arranged in a hole in the floor of a bathroom or the like and is designated .floor sink in the following, is preferably cast in one piece of iron or the like and comprises a rather wide, substantially horizontal, peripheral rim or flange 1. Inwardly of the rim 1 there extends a vertical groove 4 and inwardly thereof there is a ridge 7 which may be provided with spaced slots or holes to permit outflow of water from the groove 4. All surfaces of the abovementioned portions of the floor sink preferably are unmachined cast iron surfaces. A Water-tight and hygienic connection between the floor sink and the floor is attained by the provision of a floor-carpet of plastics 11 which is depressed in the groove 4 and secured therein by a ring 17 of soft plastics, preferably polyvinyl chloride.

The water trap of the floor sink comprises a low, wide damming ridge 3 and a downwards and inwards inclined wall 5 which projects from the rim 1. Where the wall 5 ends, an annular flange 6 which is made integral with the walls of the floor sink is provided within the latter. The upper face of the flange 6 is located rather deep below the upper level of the water trap, as is evident from the fact that the measure a from the bottom of the water trap to the upper face of the flange 6 is actually less than half of the measure b which is the height of the water trap. The flange 6 constitutes a support for the bottom member 8 of a shut off valve which may be secured from above to the flange 6 by means of bolts or screws 9, preferably three in number. Complete sealing between the bottom member 8 and the flange 6 is provided for by a packing 10. The bottom member 8 has a round opening corresponding to the opening in the flange 6 and in respect of its area in agreement with the flow area of the water trap. As anchoring means for an upper member 12 of the valve there is provided a three-armed bridge 13 which projects from the bottom member 8 and which may most simply bedescribed as a semi-spherical slotted shell or open-work. In its central portion it has a threaded, vertical bore 14. The upper face of the lower annular member 8 is tapered; that is, said face is concave as seen from above. Said upper face is carefully ground to make a tight seal against the peripheral edge of the upper member 12 which has the shape of a semispherical shell larger than the bridge 13 and provided with a downwardly directed bolt 15 and an upwardly directed square-headed bolt 16, both preferably integral with the upper member 12. Through the screwing in of the bolt 15 into the bore 14, the valve becomes closed, partly or completely. Even in its completely open state, that is when the flow area of the valve is as large as that of the water trap, the sealing surface of the upper member is still located entirely below the liquid level of the water trap.

The mode of operation is as follows:

When the valve is open, the water trap becomes filled with flowing water to a depth equal to the measure b. This means that all sealing surfaces of the valve are always immersed in water so that mud can never get caught by and stick to the sealing surfaces and jeopardize the sealing when the valve is to be closed on a later occasion. On account of the particularly deep location of the flange 6, below half of the height of the water trap, scaling is secured even if washing takes place at long intervals. The semi-spherical shape of the parts of the valve or shut off means permits the attainment of a suflicient flow area at a predetermined diameter, while maintaining the height of the valve so low that it remains entirely immersed in water, even in the open condition of the valve. This guarantees a considerably improved hygiene, since impurities which would else become caught by and stick to the valve, will now be prevented from putrefaction and concomitant inconveniences.

While the invention has been particularly shown and described with reference to one preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

What I claim is:

In a floor sink adapted to be mounted in an opening in a floor and comprising a substantially peripheral flange adapted to be secured to said floor, a water trap defining a predetermined liquid level in said sink, and a drainpipe forming an outlet from said water trap; an internal support flange; and a shut-off valve supported by and secured to said internal flange, said shut-ofl? valve comprising an outer, semi-spherical shell, an inner semi-spherical shell spaced from and located within said outer shell and a threaded connection between said shells, said inner shell being radially slotted and being provided with a substantially plane, annular disc facing the peripheral rim of said outer shell, which is adapted to have its said peripheral rim sealingly pressed against said annular disc with an adjustable pressure by means of said threaded connection, said annular disc being in sealing engagement with said internal flange and said valve being adjustable from above and having sealing surfaces located below said predetermined liquid level of said water trap when the valve is open as well as when it is closed, said slots in said inner shell extending to said disc and being constructed and arranged to establish communication for fluid flow through said valve around said peripheral rim 3 4 and through said slots when the outer shell is threaded 1,332,692 3/1920 Spiekerman 251227 away from the inner shell. 1,860,468 5/ 1932 MacLean 251-360 X 2,298,551 10/1942 Davisson 137243.13 X

References Cited by the Examiner 903,569 11/1908 Heeney 137 247.13 X LAMBERT, Assistant Examiner- 

